Mean Arterial Pressure (MAP) Calculator
Compute mean arterial pressure from a blood-pressure reading — the perfusion pressure that matters at the bedside and in the cath lab.
How it works
MAP = DBP + ⅓ × (SBP − DBP), because roughly two-thirds of the cardiac cycle is spent in diastole. A MAP of about 65 mmHg or more is generally needed to perfuse vital organs.
Frequently asked questions
How do you calculate mean arterial pressure?
MAP = diastolic BP + ⅓ × (systolic BP − diastolic BP).
What is a normal mean arterial pressure?
About 70–100 mmHg; a MAP of at least 65 mmHg is generally needed to perfuse the organs.
Why is MAP more useful than systolic pressure?
It reflects the average pressure driving blood to the organs across the whole cardiac cycle, not just the peak.
Educational tool. These calculators are for study and RCIS exam preparation only — not for clinical decision-making or patient dosing. Always follow institutional protocols and verify with a qualified clinician.